Fastening.



PATENTED JUNE 9, 1908.

F. H. PERRY. FASTENING. APPLIUATION rump 1121.14. 1906.

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UNITED STATES PATENT OFFICE. FREDERICK H. PERRY, OF BEVERLY, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MA- CHINERY COMPANY, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

FASTENING.

No. 890,447. Specification of Letters Patent.

Application filed April 14, 1906. Serial No. 311,662.

Patented June 9, 1908.

increase the holding power of the fastening. surface of the fastening be tween the ribs forming the threads is preferably roughened in such manner that as the fastening is inserted the d by reason of with portions gures.

This invention relates to metallic fastenings, more particularly to screw-threaded fastenings, for securing together material such, for example, as the outerthe outersoles of boots and shoes to their innersoles a screw-threaded fastening is desirable because it can be inserted without using an awl for forming an opening eferring to the drawing, the fastenings are preferably made in the form of a wire by the aving a body portion 10 of indefinite length, e conveniently coiled, as shown, or use in a machine for screwing one end of the coil through the outer sole and into the inner sole of a boot or shoe, conveniently t us prevent a rotation e screw threaded fastenings heretofore his space has contributed but little to the holding capacity because the frictional resistance afforded by the mere rubbing of the The body portion 10 of the wire is here shown as provided with spirally-arranged parallel threads 12 and 14 which formed in any convenient manner, as by rollsmooth wire between roller dies. At the same time series of depressions 16 which may be of any convenient configuration. These depressions sole. displacement in either direction are here shown as cup-shaped but referably causes inconvenlence to the person wearing comparatively shallow, so that tlieir edges the shoe. orm obtuse angles with the surface of the The present invention obviates this objecfastenings, and thus in no sense act as cuttion by providing ascrew-threaded fastenin ting or grinding edges for pulverizing the which will successfully resist a torsiona stock into which the wile is inserted B strain and will, therefore, wear without dis placement as the shoe sol means for accomplishing this is by utilizing h an extent that after the wire the space or groove between the threads to has been inserted the fibers of spaces between the threads, when the doublethreaded wire is used, as illustrated by Fig. 6.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is 1- 1. A screw-threaded fastening device comprising a body portion having upon it an uninterrupted smooth sided helical rib forming the thread, and having between the turns of the rib an interrupted face.

2. As a new article of manufacture, a screw wire having a series of depressions formed in that portion of its surface between the ribs forming the threads, each of said depressions having a nib or raised portion which projects from its surface.

3. As a new article of manufacture, a screw wire having a series of depressions formed in the surface of the spaces between the threads, each of said depressions having a nib or raised portion which projects from substantially the center of its surface and is of a height substantially equal to the depth of the depression.

4. A screw-threaded fastening device comprising a body portion having upon it a smooth sided continuous helical rib forming a thread, and having upon its surface between the turns of said thread a series of depressions, the edges of said depressions forming obtuse angles with the surface of said space, whereby when the device is inserted into stock the fibers thereof are merely forced aside and spring back into said depressions to form a locking means for preventing rotation of the device.

In testimony whereof I have signed my name to this specification 1n the presence of two subscribing witnesses.

FREDERICK H. PERRY.

Witnesses:

ARTHUR L. RUssnLL, WARREN G. OGDEN.

are enabled to spring back from the position into which they have been forced, into the depressions, and, by filling them, form a locking means for preventing rotation of the wire, which consists of an integral portion of the stock projecting within the surface of the body portion of the fastening.

Although the depressions 16 alone materially increase the holding power of the fastening, an added advantage is gained by forming said depressions with a slight projection or nib 20 substantially in the center of each depression and extending outwardly, preferably not further than the surface of that portion of the wire in which the depressions are formed.

The results of tests made with fastenings embodying this invention have demonstrate that their capacity to resist a torsional strain has been largely increased over that of the double-thread wire with smooth grooves between the threads, such as has been generally used heretofore.

The wire is preferably given a double thread because such a formation enables the cutters of the inserting machine to sever the fastening without destroying the thread. The double thread also increases the holding power of the wire to some extent. It is obvious, however, that a single-thread wire provided with the roughened surface herein described would prove effective in overcoming a, rotation of the fastening while the shoe is being worn.

It will be understood that the expressions in the claims, between the turns of the rib, surface between the ribs forming the threads and spaces between the threads are not intended to refer to all of said surface or to each and every space, as it is obvious that the desired end may be gained to some degree by forming the depressions over a por tion only of the surface named, for example, as illustrated by Fig. 5, or in alternate 

